Question

A sample of sodium hydroxide (NaOH) has a mass of 54.3 g. How many moles are in this sample?

Answer 1

Solution:

The molar mass of NaOH is 40 g/mol.

Converting from mass of NaOH to moles:

Moles of NaOH = 54.3 g NaOH × (1 mol NaOH / 40 g NaOH) = 1.3575 mol NaOH = 1.36 mol NaOH

Moles of NaOH = 1.36 mol

Answer: 1.36 moles of NaOH are in the sample.